101 102 103-50

0

50

Frequency (rad/sec)

Gai

n (d

B)

101 102 103-200

-100

0

Frequency (rad/sec)

Pha

se (d

eg)

What K will keep the system stable for the following OL systems?

http://www.facstaff.bucknell.edu/mastascu/eControlHTML/Freq/Nyquist3.html#BodeInterpretation

http://www.facstaff.bucknell.edu/mastascu/eControlHTML/Freq/Nyquist4.html

Sketch the root locus, Nyquist and Bode plots for (i) a type 0, third order system, and

(ii) type 1 third order system. Then identify gain and phase margins.

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